Arizona plans to implement a dual-track voting system allowing people who register to vote without submitting proof of citizenship to cast ballots only for federal offices such as Congress, but not for state or local seats. A spokesman for Arizona Secretary of State Ken Bennett says he will implement the system recommended under an opinion issued Monday by state Attorney General Tom Horne. The vast majority of Arizonans register to vote using a state form that requires proof of citizenship that is required under a 2004voter-approved law. However, the U.S. Supreme Court ruled in June that Arizona and other states are required to accept a federal voter registration form. The federal form requires registrants to say they are citizens but it does not require that they submit proof.